Yagami Ryoya, a lonely high school boy with nothing to his name, spends his days in emptiness. As he is returning home from school as usual, he gets caught up in a random murder case. Ryoya tries to escape, but he sees two twin sisters, Tsurugi Reona and Tsurugi Riona, who are reputed to be the most beautiful twin sisters in school, about to be attacked. Unable to abandon Reona and Riona, Ryoya risked his life to save them, but he ended up making the sisters, who were actually yandere, fall madly in love with him. What will happen to Ryoya, who is now being targeted by these two yandere sisters?